The title
character is a real live dinosaur, a Tyrannosaurus Rex, that was once
discovered via a hole leading to a lost, prehistoric world inside the
Earth. Through experiments scientist Dexter Dynamo managed to alter the
dinosaur's reckless behaviour and improve considerably on its
intelligence.
Later, the scientist's young son Derek forms a partnership
with the giant animal using it as a means to fight crimes. For that
purpose they are both equipped with an array of gadgets enabling them to
fight convincingly.